Attachment for squares.



No. 821,115. PATENTE!) MAY 22, 190e.

M. NIGHOLLS.

ATTACHMENT FOR SQUARES. APPLIOATION FILED Nov. 25.1905.

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S 17 S IIlIIIIIH llllllill llll! III!! IIIIYIIIIIII 6 WTNESSES INVENTOR No. 821,115. lPATBNTBD MAY 22, 1906.

. M. NIoHoLLs.

ATTACHMENT FOR SQUARES. APPLIOATION FILED Nov.z5,19o5.

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WYTNESSES Y IN VEN T 0R @L7/QW 77M UNITED STATESH ingENT oEEro.

MOSES NIOHOLLS, OF OTTUMWA, IOWA, ASSIGNOR TO JAMES GRAY, VILLIAM O. HUGUS, AND WILLARD WEBSTER, OF OT'IUMVVA, IOWA.

ATTACHMENT FOR SQUARES.

Specification of Letters Patent.

Patented May 22, 1906.

Application led November 25, 1905. Serial No. 289,037.

To all tf1/wm, it n1/ty concern,.-

Be it known that I, MosEs NIcHoLLs, a resident of Ottumwa, in the county of Wa pello and State of Iowa, have invented certain new and useful Improvements in Attachn ments for Squares; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to improved attachments for squares, the object of the invention being to provide a graduated bar with improved mounting on the arms of a square and also provide an improved quadrant or sector having a scale thereon to register with the edge of the graduated bar and indicate the pitch of the hypotenuse of any right-angle triangle sought to be measured, and the graduations on the bar indicate the length of the hypotenuse of the angle.

With these objects in view the invention consists in certain novel features of construction and combinations and arrangements of parts, as will be more fully hereinafter described, and pointed out in the. claims.

In the accompanying drawings, Figure 1 is a view in elevation, illustrating one form of my improvements. Fig. 2 is a view in crosssection on the line 2 2 of Fig. 1. Fig. 3 is a view in cross-section on the line 3 3 of Fig. 1, and Figs. 4 and 5 are views of a modification.

1 represents an ordinary square, both arms of which are marked off in proper scale, and 2 represents a graduated bar suitably marked.

3 and 4 represent clips mounted to slide on the arms of square 1 and are each provided with thumb-screws 5 to clamp them at any point of adjustment on the square. Clip 3 is 6, on which one end of graduated bar 2 is pivotally secured, the otherend of the bar being located in an angular sleeve 7, connected with clip 4 by a swivel or pivot-pin '7a to freely turn on clip 4, and a thumb-screw 9 is located in sleeve 7 to engage bar 2 and clamp it at any adjustment.

A quadrant or sector 10 is secured to clip 3 and has radial markings and lettering to indi- 5o cate the pitch of bar 2. In other words,

when bar 2 is adjusted so as to bring its edge provided at one end with. a bolt or pivotepin to register with the square to find the length of the hypotenuse of anyright-angle triangle a glance at the quadrant or sector will show the pitch of the hypotenuse, for the edge of the bar 2 will register with the markings on the quadrant or sector.

In the modification illustrated in Figs. 4 and 5 the bar 2 is made with a longitudinal slot to receive a screw 11 on clip 4, said screw also passed through a pointer 12 to register with the scale on the bar, and a thumb-nut 13 is located on the screw to clamp the bar at the proper adjustment.

Slight changes might be made in the general form and arrangement of parts described without departing from my invention, and hence I do not restrict myself to the precise details set forth, but consider myself at liberty to make such slight changes and alterations as fairly fall within the spirit and scope of my invention.

Having fully described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. An attachment for a square, comprising two clips, means for securing said clips at any desired adjustment on the arms of a square, one of said clips provided with an integral graduated quadrant projecting laterally therefrom, a graduated bar pivoted at one end to the clip having the graduated quadrant and means for adjustably securing said graduated bar to the other clip.

2. The combination with clips to be adjustably secured to the arms of a square, and a sleeve pivotally attached to one of said clips, a graduated bar pivoted to one clip and movable through the sleeve on the other clip, a sector or quadrant secured to the Erst-mentioned clip and marked. to register with the edge of the bar and indicate the pitch thereof.

3. T he combination with clips to be adjustably secured to the arms of a square, a graduated bar pivoted atone end to one clip, a rotary angular sleeve swiveled to the other clip and adapted to receive the bar, a thumbscrew in the sleeve to clamp the bar, and a sector or quadrant carried by the firstemene tioned clip and marked to register with the edge of the bar and indicate the pitch thereof.

4. The combination with clips to be located IOO on the arms of a square and thumb-screws t0 specification in the presence of tWo subscribclamp the clips to the square, a graduated ing Witnesses.

bai' pivoted to one clip, an angular sleeve swiveled to the other eli and adapted to receive the bar, and a t limb-screw in the Witnesses:

sleeve to clamp the bar. ANNA J. FULLEN,. In testimony whereof I have signed this CHAs. D. FULLEN.

MOSES NICHOLLS. 

